Loans Part 3 (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Recorded Investment [Abstract]
Total	$ 11,577,444,000	$ 11,269,743,000	$ 10,589,835,000
Related Allowance [Abstract]
Allowance For Financing Receivable Total	244,209,000	253,481,000	289,549,000	292,971,000
Internally Assigned Grade [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	9,688,663,000	9,363,641,000	8,883,651,000
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	157,753,000	160,086,000	216,691,000
Internally Assigned Grade [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	9,355,676,000	9,026,605,000	8,503,488,000
Internally Assigned Grade [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	172,552,000	160,547,000	182,721,000
Internally Assigned Grade [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	160,435,000	176,489,000	197,442,000
Non-graded [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	1,888,781,000	1,906,102,000	1,706,184,000
Related Allowance [Abstract]
Allowance For Financing Receivable Non- Graded	42,106,000	47,045,000	47,609,000
Non-graded [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	1,865,857,000	1,881,305,000	1,677,664,000
Non-graded [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	22,924,000	24,797,000	28,520,000
Commercial Loan [Member]
Recorded Investment [Abstract]
Total	6,942,641,000	6,571,454,000	6,048,257,000
Related Allowance [Abstract]
Allowance For Financing Receivable Total	85,972,000	83,443,000	113,706,000
Commercial Loan [Member] | Commercial Energy Financing Receivable [Member]
Recorded Investment [Abstract]
Total	2,206,490,000	2,015,619,000	1,759,452,000
Commercial Loan [Member] | Commercial Services Financing Receivable [Member]
Recorded Investment [Abstract]
Total	1,881,079,000	1,745,189,000	1,586,785,000
Commercial Loan [Member] | Commercial Wholesale Retail Financing Receivables [Member]
Recorded Investment [Abstract]
Total	1,002,780,000	962,984,000	984,273,000
Commercial Loan [Member] | Commercial Manufacturing Financing Receivable [Member]
Recorded Investment [Abstract]
Total	362,061,000	350,834,000	380,043,000
Commercial Loan [Member] | Commercial Healthcare Financing Receivable [Member]
Recorded Investment [Abstract]
Total	987,436,000	976,481,000	840,809,000
Commercial Loan [Member] | Commercial Integrated Food Services Financing Receivables [Member]
Recorded Investment [Abstract]
Total	209,642,000	208,738,000	211,637,000
Commercial Loan [Member] | Commercial Integrated Food Services Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded		0
Commercial Loan [Member] | Commercial Other Commercial and Industrial [Member]
Recorded Investment [Abstract]
Total	293,153,000	311,609,000	285,258,000
Commercial Loan [Member] | Internally Assigned Grade [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	6,925,059,000	6,552,986,000	6,029,226,000
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	84,853,000	82,263,000	111,561,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	6,780,363,000	6,410,746,000	5,872,358,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	83,019,000	73,481,000	99,569,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	61,677,000	68,759,000	57,299,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Energy Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	2,197,167,000	2,013,866,000	1,754,327,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Energy Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	8,987,000	1,417,000	4,710,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Energy Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	336,000	336,000	415,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Services Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	1,829,140,000	1,696,883,000	1,535,177,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Services Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	39,049,000	31,338,000	35,888,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Services Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	12,890,000	16,968,000	15,720,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Wholesale Retail Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	964,288,000	907,648,000	902,603,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Wholesale Retail Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	23,104,000	34,156,000	51,259,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Wholesale Retail Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	15,388,000	21,180,000	30,411,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Manufacturing Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	328,542,000	325,393,000	372,557,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Manufacturing Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	10,117,000	2,390,000	2,941,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Manufacturing Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	23,402,000	23,051,000	4,545,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Healthcare Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	978,484,000	967,581,000	834,837,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Healthcare Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	1,006,000	3,414,000	3,398,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Healthcare Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	7,946,000	5,486,000	2,574,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Integrated Food Services Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	208,892,000	207,982,000	210,258,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Integrated Food Services Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	750,000	756,000	1,373,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Integrated Food Services Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	6,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Other Commercial and Industrial [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	273,850,000	291,393,000	262,599,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Other Commercial and Industrial [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	6,000	10,000	0
Commercial Loan [Member] | Internally Assigned Grade [Member] | Commercial Other Commercial and Industrial [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	1,715,000	1,738,000	3,628,000
Commercial Loan [Member] | Internally Assigned Grade [Member] | Consumer Loans Auto Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded		0
Commercial Loan [Member] | Non-graded [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	17,582,000	18,468,000	19,031,000
Related Allowance [Abstract]
Allowance For Financing Receivable Non- Graded	1,119,000	1,180,000	2,145,000
Commercial Loan [Member] | Non-graded [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	17,509,000	18,416,000	18,881,000
Commercial Loan [Member] | Non-graded [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	73,000	52,000	150,000
Commercial Loan [Member] | Non-graded [Member] | Commercial Energy Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Energy Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Services Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Services Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Wholesale Retail Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Wholesale Retail Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Manufacturing Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Manufacturing Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Healthcare Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Healthcare Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Integrated Food Services Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Integrated Food Services Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Loan [Member] | Non-graded [Member] | Commercial Other Commercial and Industrial [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	17,509,000	18,416,000	18,881,000
Commercial Loan [Member] | Non-graded [Member] | Commercial Other Commercial and Industrial [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	73,000	52,000	150,000
Commercial Real Estate [Member]
Recorded Investment [Abstract]
Total	2,264,103,000	2,279,909,000	2,222,982,000
Related Allowance [Abstract]
Allowance For Financing Receivable Total	62,742,000	67,034,000	94,535,000
Commercial Real Estate [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Recorded Investment [Abstract]
Total	311,708,000	327,480,000	394,337,000
Commercial Real Estate [Member] | Commercial Real Estate Retail Financing Receivables [Member]
Recorded Investment [Abstract]
Total	481,815,000	509,743,000	420,193,000
Commercial Real Estate [Member] | Commercial Real Estate Office Financing Receivables [Member]
Recorded Investment [Abstract]
Total	386,025,000	406,508,000	488,515,000
Commercial Real Estate [Member] | Commercial Real Estate Multifamily Financing Receivables [Member]
Recorded Investment [Abstract]
Total	432,546,000	368,519,000	355,240,000
Commercial Real Estate [Member] | Commercial Real Estate Industrial [Member]
Recorded Investment [Abstract]
Total	287,462,000	277,733,000	177,807,000
Commercial Real Estate [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member]
Recorded Investment [Abstract]
Total	364,547,000	389,926,000	386,890,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	2,264,103,000	2,279,909,000	2,222,982,000
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	62,742,000	67,034,000	94,535,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	2,104,466,000	2,113,478,000	2,035,307,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	73,162,000	67,238,000	62,171,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	86,475,000	99,193,000	125,504,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	230,854,000	238,362,000	285,438,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	28,438,000	27,244,000	18,192,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	52,416,000	61,874,000	90,707,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Retail Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	466,983,000	499,636,000	409,917,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Retail Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	8,639,000	3,244,000	5,000,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Retail Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	6,193,000	6,863,000	5,276,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Office Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	362,855,000	382,503,000	450,424,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Office Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	12,437,000	12,548,000	23,463,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Office Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	10,733,000	11,457,000	14,628,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Multifamily Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	419,732,000	356,927,000	347,637,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Multifamily Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	9,400,000	8,079,000	5,703,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Multifamily Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	3,414,000	3,513,000	1,900,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Industrial [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	287,185,000	277,453,000	177,516,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Industrial [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	277,000	280,000	291,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Industrial [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	336,857,000	358,597,000	364,375,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	13,971,000	15,843,000	9,522,000
Commercial Real Estate [Member] | Internally Assigned Grade [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	13,719,000	15,486,000	12,993,000
Commercial Real Estate [Member] | Non-graded [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Related Allowance [Abstract]
Allowance For Financing Receivable Non- Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Retail Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Retail Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Office Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Office Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Multifamily Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Multifamily Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Industrial [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Industrial [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Commercial Real Estate [Member] | Non-graded [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0
Total			0
Residential Mortgage [Member]
Recorded Investment [Abstract]
Total	1,960,888,000	1,970,461,000	1,777,321,000
Related Allowance [Abstract]
Allowance For Financing Receivable Total	34,713,000	39,207,000	45,649,000
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member]
Recorded Investment [Abstract]
Total	1,133,191,000	1,150,321,000	1,153,269,000
Residential Mortgage [Member] | Home Equity [Member]
Recorded Investment [Abstract]
Total	646,835,000	635,167,000	560,500,000
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member]
Recorded Investment [Abstract]
Total	180,862,000	184,973,000	63,552,000
Residential Mortgage [Member] | Internally Assigned Grade [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	292,891,000	314,475,000	403,264,000
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	7,482,000	8,262,000	8,611,000
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	271,644,000	291,155,000	374,699,000
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	13,735,000	15,879,000	16,493,000
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	7,512,000	7,441,000	12,072,000
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	271,644,000	291,155,000	374,699,000
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	13,735,000	15,879,000	16,493,000
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	7,512,000	7,441,000	12,072,000
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Home Equity [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Home Equity [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Home Equity [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Residential Mortgage [Member] | Internally Assigned Grade [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Residential Mortgage [Member] | Non-graded [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	1,667,997,000	1,655,986,000	1,374,057,000
Related Allowance [Abstract]
Allowance For Financing Receivable Non- Graded	27,231,000	30,945,000	37,038,000
Residential Mortgage [Member] | Non-graded [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	1,648,047,000	1,633,660,000	1,348,305,000
Residential Mortgage [Member] | Non-graded [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	19,950,000	22,326,000	25,752,000
Residential Mortgage [Member] | Non-graded [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	824,990,000	817,921,000	728,611,000
Residential Mortgage [Member] | Non-graded [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	15,310,000	17,925,000	21,394,000
Residential Mortgage [Member] | Non-graded [Member] | Home Equity [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	642,195,000	630,766,000	556,142,000
Residential Mortgage [Member] | Non-graded [Member] | Home Equity [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	4,640,000	4,401,000	4,358,000
Residential Mortgage [Member] | Non-graded [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	180,862,000	184,973,000	63,552,000
Residential Mortgage [Member] | Non-graded [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0	0	0
Consumer Loan [Member]
Recorded Investment [Abstract]
Total	409,812,000	447,919,000	541,275,000
Related Allowance [Abstract]
Allowance For Financing Receivable Total	16,432,000	17,447,000	10,410,000
Consumer Loan [Member] | Consumer Loans Auto Financing Receivable [Member]
Recorded Investment [Abstract]
Total	81,791,000	105,149,000	198,663,000
Consumer Loan [Member] | Consumer Other Financing Receivable [Member]
Recorded Investment [Abstract]
Total	328,021,000	342,770,000	342,612,000
Consumer Loan [Member] | Internally Assigned Grade [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	206,610,000	216,271,000	228,179,000
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	2,676,000	2,527,000	1,984,000
Consumer Loan [Member] | Internally Assigned Grade [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	199,203,000	211,226,000	221,124,000
Consumer Loan [Member] | Internally Assigned Grade [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	2,636,000	3,949,000	4,488,000
Consumer Loan [Member] | Internally Assigned Grade [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	4,771,000	1,096,000	2,567,000
Consumer Loan [Member] | Internally Assigned Grade [Member] | Consumer Loans Auto Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Consumer Loan [Member] | Internally Assigned Grade [Member] | Consumer Loans Auto Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Consumer Loan [Member] | Internally Assigned Grade [Member] | Consumer Loans Auto Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Consumer Loan [Member] | Internally Assigned Grade [Member] | Consumer Other Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	199,203,000	211,226,000	221,124,000
Consumer Loan [Member] | Internally Assigned Grade [Member] | Consumer Other Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	2,636,000	3,949,000	4,488,000
Consumer Loan [Member] | Internally Assigned Grade [Member] | Consumer Other Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	4,771,000	1,096,000	2,567,000
Consumer Loan [Member] | Non-graded [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	203,202,000	231,648,000	313,096,000
Related Allowance [Abstract]
Allowance For Financing Receivable Non- Graded	13,756,000	14,920,000	8,426,000
Consumer Loan [Member] | Non-graded [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	200,301,000	229,229,000	310,478,000
Consumer Loan [Member] | Non-graded [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	2,901,000	2,419,000	2,618,000
Consumer Loan [Member] | Non-graded [Member] | Consumer Loans Auto Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	79,183,000	102,955,000	196,199,000
Consumer Loan [Member] | Non-graded [Member] | Consumer Loans Auto Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	2,608,000	2,194,000	2,464,000
Consumer Loan [Member] | Non-graded [Member] | Consumer Other Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	121,118,000	126,274,000	114,279,000
Consumer Loan [Member] | Non-graded [Member] | Consumer Other Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	293,000	225,000	154,000
Allocated Class of Receivables [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	9,688,663,000	9,363,641,000	8,883,651,000
Financing Receivable Non - Graded	1,888,781,000	1,906,102,000	1,706,184,000
Total	11,577,444,000	11,269,743,000	10,589,835,000
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	157,753,000	160,086,000	216,691,000
Allowance For Financing Receivable Non- Graded	42,106,000	47,045,000	47,609,000
Allowance For Financing Receivable Total	199,859,000	207,131,000	264,300,000
Unallocated Financing Receivables [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0	0
Financing Receivable Non - Graded	0	0	0
Total	0	0	0
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	0	0	0
Allowance For Financing Receivable Non- Graded	0	0	0
Allowance For Financing Receivable Total	$ 44,350,000	$ 46,350,000	$ 25,249,000